ke an ende, [Sidenote: A squyre.]
and wyll sette forthe on example of a syseangle, whiche I had
almost forgotten, and that is it, whose vse commeth often in
Geometry, and is called a _squire_, is made of two long squares
ioyned togither, as this example sheweth.

[Illustration]

And thus I make an eand to speake of platte formes, and will
briefelye saye somwhat touching the figures of _bodeis_ which
partly haue one platte forme for their bound, and y^t iust round
as a _globe_ hath, or ended long as in an _egge_, and a _tunne
fourme_, whose pictures are these.

[Illustration: The globe as is before.]

Howe be it you must marke that I meane not the very figure of a
tunne, when I saye tunne form, but a figure like a tunne, for a
_tune fourme_, hath but one plat forme, and therfore must needs
be round at the endes, where as a _tunne_ hath thre platte
formes, and is flatte at eche end, as partly these pictures do
shewe.

_Bodies of two plattes_, are other cantles or halues of those
other bodies, that haue but one platte forme, or els they are
lyke in foorme to two such cantles ioyned togither as this A.
doth partly eppresse: or els it is called a _rounde spire_, or
_stiple fourme_, as in this figure is some what expressed.

[Sidenote: A rounde spier.]

Nowe of three plattes there are made certain figures of bodyes,
as the cantels and halues of all bodyes that haue but ij.
plattys, and also the halues of halfe globys and canteles of a
globe. Lykewyse a rounde piller, and a spyre made of a rounde
spyre, slytte in ij. partes long ways.

But as these formes be harde to be iudged by their pycturs,
so I doe entende to passe them ouer with a great number of other
formes of bodyes, which afterwarde shall be set forth in the
boke of Perspectiue, bicause that without perspectiue knowledge,
it is not easy to iudge truly the formes of them in flatte
protacture.

And thus I made an ende for this tyme, of the definitions
Geometricall, appertayning to this parte of practise, and the
rest wil I prosecute as cause shall serue.

THE PRACTIKE WORKINGE OF
+sondry conclusions geometrical.+

THE FYRST CONCLVSION.

To make a threlike triangle on any lyne measurable.

Take the iuste length of the lyne with your compasse, and stay the
one foot of the compas in one of the endes of that line, turning
the other vp or doun at your will, drawyng the arche of a circle
against the midle of the line, and